136 
A. G. Nicholls. 
Female: Length, l*71inm. Body less slender than is usual in the 
genus and with a wide g(mital s(^gment, the remaining stiginents of the uro- 
sonu- l)(‘ing Tiuieli TiaiTower (fig. 2). Rostrum small, tlowin\'ardly projecting, 
not visible from above. First antenna 9-segmented, with sensory filament 
on Uio fourth ; second antenna -with 2-segmontod exopod ; mandible palp 
birarnous ; .maxillule, maxilla, and maxilliped well developed (fig. 2), similar 
to those of the type species. First logs slender, rami subo(]ual, exojiod with 
\ ery long middle segment. Seta formula for legs 2-4 : 
endopod 
exopod 
P- 2 
1 2 221 
1 1 223 
P- 3 
1 1 321 
1 1 323 
P- 4 
1 1 221 
1 1 323 
Fifth *]egs of the usual type for the genus but with small differences in 
armature. The basal segment lacks the inner seta found in 77 iysis, ■pammysis 
Monard (1928, p. 345) and royi (Monard, 1928, p. 354), and the distal segment 
shows two of the terminal setae transformed into spines, instead of the usual 
one. Caudal rami about tliree times as wide as long. 
Male : Unknown. 
This species is distinguished from all other known species in the great 
widtli of the genital segment. In other respects it is not unlike mysis, but 
differs in tiie exopod of the second antenna and in the fifth legs. It resembles 
Willey’s variety tnymn harringtoni (1935, p. 93) in the seta formula, the end 
segment of the secoiul endopod having only two inner setae, whereas in ynysis 
and parayuysis there an; three. -I.n the shape and proportions of the segments 
of tlio fifth legs it rosonibles paraniysis but differs in the armature. 
Fam. DIOSACCIDAE. 
Amphiascopsis hirsutus. 
Dactylop{li)tisia hirsuta Thompson and Scott, 1903, p. 269, PI. IX,, figs. 
19-24. 
'riiis si'Jocies has boon recorded from C'cylon (Thompson and Scott) ; “ Si- 
boga ” Station 273 (A. Scott, 1909, p. 221) ; Ranyuls (Monard, 1928, p. 373) ; 
Bermuda (Willey, 1931, p. 611 ; 1935, p. 57) ; and Algeria (Monard, 1937, 
p. 32). 
The occurrence of this spocit^s on the coast of Western Australia forms yet 
another link between the fauna of Bermuda, the Mediterranean, Ceylon and 
Australia. The specimens taken boro (27 females, 1 male) wore all somewhat 
larger than those previously rocordinl : females 1 *25-1 *40 mm., male 1-17 mm. 
Tlu're can bo no doubt of its identity, the peculiar structun' of the basii^od 
of tlie male first log and second endopod, described by Willey ( 1 93J ) aro charac- 
teristic, and wore well shown in the specimen found here. As with tlie Mediter- 
ranean and Bermudan spocimons the first leg sliows the endopod considerably 
longer than was described by Thompson and Scott. 
Fam. CANTHOCAMPTIDAE. 
Orthopsyllus littoralis sp. nov. 
Female: Length 0*9 mrn. Body of usual shape, each segment except 
the first and last having the hinder margin fringed with denticles as shown in the 
figure of the urosome (fig. 3) ; this fringe comt)letely encircles the body in the 
urosome. Rostrum well defined and articulated with the liead. First antenna 
